block series can be determined by the numbers cast into the block on the drivers side belhousing area, between the filter area and the center of the block. this number can be cross checked with an AERA rebuilders book or several web sites (Mortec). This will tell you the orig bore size and casting dates,early 265-283-327's all have a round crank flange, can type oil filter, 302-327-350 are all 4" bore so you have to look for small differences in the rear counterweight where the flywheel bolts on, a 302(very rare) will have a round flange, a 327 has a ofset rectangular with very rounded corners type flange, a 350 will have an ofset rectangular with slightly rounded corners, unless you have a one piece rear main seal, then they are of course all round (no 302-327's were made).
[ March 02, 2003: Message edited by: BOBCRMAN@aol.com ]</p>
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